Electrical and optical properties characterization of MEH-PPV thin film using sol-gel method / Abdul Muhaimin Khairuddin

Many LED applications consists of various materials. One of the materials used is polymer. In this study, MEH-PPV known as poly[2-methoxy-5-(2'-ethyl-hexyloxy_-l,4- phenylenevinylene]. Synthesizing the MEH-PPV thin film by sol-gel method and characterization of various properties are the main objectives for this experiment. Synthesizing conducted using spin-coat instrument and anneal using hot furnace. For the characterization of the thin film, electrical and optical properties were the main discussion for this experiment. The material investigated by using Solar Simulator for 1-V measurement procedure. Other than that, optical measurements which are absorption and photoluminescence spectra conducted by using Raman PL Dispersive and UV-Vis Spectroscopy. Surface morphology and thickness also conducted using Surface Profiler and Atomic Force Microscopy. Data collected after all the experimental work completed and results shown similar expected measurements for all the characterizations. Moreover, the calculated conductivity was inversely proportional with the thin film thickness. Optical properties shows optimum-level for 3 layer deposition layer thickness sample and quenched as the thickness increased. Besides that, electrical measurements proved symmetrical line occurs for sample at above 3-layer of deposition. Surface morphology indicated that the roughness perpendicular with the surface thickness. All the experimental work conducted according to the proposed procedure and the documented data proved all the expectations and theories related to the objectives.